<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <div id="app">
    <home></home>
  </div>
  <script src="./vue.js"></script>
  <script>
    const CommonTitle = {
      template: `
        <div>
          a=>{{a}}
          b=>{{b}}
          c=>{{c}}
          d=>{{d}}
          <ul>
            <li v-for="item in e" :key="item">
              {{ item }}  
            </li>  
          </ul>
        </div>
      `,
  
      props:{
        a:Number,
        b: [String,Number],
        c: {
          type: String,
          required: true
        },
        d: {
          type: Number,
          default: 0
        },
        e: {
          type: Array,
          default: ()=> ['a','b','c','d']
        }
      }
    } 
    const Home = {
      template: `
        <div>
          home组件
          <common-title :a="1" :b="msg" c="你好"></common-title>
        </div>
      `,
      data(){
        return {
          msg:'我是home的二级标题'
        }
      },
      components:{
        CommonTitle
      }
    }

    Vue.component('Home', Home);

    const vm = new Vue({
      el: '#app'
    })
  </script>
</body>
</html>